JP3214966B2 - Preventing steam from entering the coke cooling tower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing a waste heat boiler from breaking into a cooling tower when a tube of a waste heat boiler is broken and steam flows into the system in a coke dry fire extinguishing system.

[0002]

2. Description of the Related Art Conventionally, fire extinguishing red hot coke from a coke oven is carried out by a wet fire extinguishing method, in which a fire extinguishing truck loaded with red hot coke is moved to a fire extinguisher tower and a large amount of water is sprinkled from the top to extinguish the fire. I was However, the wet fire extinguishing of red hot coke causes not only the huge amount of heat of red hot coke to escape to the atmosphere as steam, but also the coke breeze scattered around the surroundings due to the generated water vapor, which poses a pollution problem. Will be raised. For this reason, the recent mainstream fire extinguishing of red hot coke is a coke dry fire extinguishing that can effectively utilize the huge amount of heat possessed by red hot coke, improve coke quality, and solve or reduce the problem of dust pollution.

As shown in FIG. 4, a coke dry-fire extinguishing system receives red-hot coke carbonized in a coke oven in a coke bucket mounted on a bucket truck, and forms a cooling tower 53 of a dry-type fire extinguishing tower comprising a pre-chamber 51 and a cooling chamber 52. The coke bucket is hoisted by a hoist at the top, and the pre-chamber 5
1 Open the charging lid at the top and insert the pre-chamber 51
The heat is exchanged with the circulating inert gas introduced from the circulating inert gas injection port 54 provided at the lower part of the lower cooling chamber 52, and 20
After cooling to about 0 ° C., the coke is cut out from the coke cut-out device 55 at the bottom at a constant rate, and is conveyed to the blast furnace.
The inert gas heated to about 800 ° C. by heat exchange with the red hot coke is transferred from a small flue 56 provided around the boundary between the pre-chamber 51 and the cooling chamber 52 to an annular flue in the outer wall of the pre-chamber. After passing through 57 to a flue 58, the dust is primarily removed by a primary dust remover consisting of a dust-removing grid brick 59 provided in the flue, then introduced into a waste heat boiler 60 for heat recovery, and secondary dust removed by a cyclone 61 or the like. The air is blown again by the circulation blower 62 from the circulation inert gas injection port 54 provided at the lower part of the cooling chamber.

Most of the circulating inert gas in the coke dry fire extinguishing system is nitrogen gas and carbon dioxide gas, and also contains flammable hydrogen gas and carbon monoxide gas generated from red hot coke. For this reason, the circulating inert gas burns flammable hydrogen gas and carbon monoxide gas by the dilution air blown in the flue so as not to enter the explosion limit. Furthermore, waste heat boilers for coke dry fire extinguishing equipment are required to be regularly inspected by the Industrial Safety and Health Law, but no measures should be taken in the event that steam from the waste heat boiler tubes is damaged and steam leaks out. It has not been done yet.

[0005]

When the tube of the waste heat boiler of the coke dry fire extinguishing system is broken, steam is mixed in the circulating inert gas and moves to the cooling tower, where the water reacts with the steam and coke. As a result, flammable hydrogen gas and carbon monoxide gas are generated, resulting in a risk of abnormal combustion.

An object of the present invention is to minimize the intrusion of steam into a cooling tower and to safely discharge the steam out of the system in the event that steam from a tube of a waste heat boiler is damaged and steam leaks out. It is an object of the present invention to provide a method for preventing steam from entering a coke cooling tower.

[0007]

Means for Solving the Problems The present inventors have conducted various tests and studies to achieve the above object. As a result, steam leaks due to boiler tube breakage may increase the flow rate difference between the amount of water supplied to the waste heat boiler and the amount of generated steam, or increase the hydrogen concentration of the gas analyzer in the gas circulation duct and the pressure inside the cooling tower. Pay attention to the cause, whether the flow rate difference between the amount of water supplied to the waste heat boiler and the amount of generated steam exceeds a predetermined value,
Alternatively, when the hydrogen concentration of the gas analyzer in the gas circulation duct or the pressure in the cooling tower rises to a predetermined value or more, the circulation blower is stopped and the nitrogen gas injection nozzles installed at various points in the circulation system of the circulation inert gas are used. By injecting nitrogen gas from a nitrogen gas injection nozzle near the inlet and outlet of the cooling tower and discharging it from a discharge section provided in a gas circulation duct, etc., it is possible to minimize the invasion of steam into the cooling tower And reached the present invention.

[0008] That is, the first invention of the present application is to provide a method in which when steam flows into the system due to breakage of a tube of a waste heat boiler of a coke dry fire extinguishing system, a flow rate difference between a water supply amount to the waste heat boiler and a generated steam amount is determined. If the value exceeds the value, or if the hydrogen concentration of the gas analyzer in the gas circulation duct or the pressure in the cooling tower rises above a predetermined value, the circulation blower is stopped and the nitrogen gas installed in various places in the circulation system of the circulation inert gas Of the blowing nozzles, nitrogen gas is blown from a nitrogen gas blowing nozzle near an inlet and an outlet of the cooling tower, and discharged from a discharge part provided in a gas circulation system and purged. This is a method for preventing vapor intrusion.

Further, the second invention of the present application is directed to a method of manufacturing a coke dry type fire extinguishing system, in which when steam flows into the system due to breakage of a tube of a waste heat boiler, the flow rate difference between the amount of water supplied to the waste heat boiler and the amount of generated steam is reduced. When the gas concentration exceeds a predetermined value or the hydrogen concentration of the gas analyzer in the gas circulation duct and the pressure in the cooling tower rise to a predetermined value or more, the circulation blower is stopped, the damper on the gas circulation blower inlet side is closed, and then the cooling tower is cooled. Characterized in that nitrogen gas is blown from a nitrogen gas injection nozzle provided in an annular flue portion or a cooling tower outlet flue portion, and steam is discharged from a gas discharge port provided in the flue to purify the coke. This is a method for preventing steam from entering the cooling tower.

[0010] Further, the third invention of the present application is directed to a method of manufacturing a coke dry fire extinguishing system, in which when steam flows into the system due to breakage of a tube of a waste heat boiler, the flow rate difference between the amount of water supplied to the waste heat boiler and the amount of generated steam is reduced. When the hydrogen concentration of the gas analyzer in the gas circulation duct or the pressure in the cooling tower rises to a predetermined value or more, or exceeds the predetermined value, the circulation blower is stopped, then the cooling tower inlet damper is closed, and provided in the flue. Nitrogen gas is blown from a nitrogen gas injection nozzle provided in the gas discharge dead zone, and steam is discharged and purged from the upper diffusion line or the lower diffusion line provided between the circulation blower and the cooling tower inlet damper. This is a method for preventing steam from entering the coke cooling tower.

Further, the fourth invention of the present application is directed to a flow rate difference between the amount of water supplied to the waste heat boiler and the amount of generated steam when steam flows into the system due to breakage of the tube of the waste heat boiler of the coke dry fire extinguishing system. When the gas exceeds a predetermined value or the hydrogen concentration of the gas analyzer in the gas circulation duct and the pressure inside the cooling tower rise to a predetermined value or more, the circulation blower is stopped, the cooling tower inlet damper is closed, and the cooling tower circle is closed. Nitrogen gas is blown from a nitrogen gas injection nozzle provided at a ring flue or a cooling tower outlet flue and a cooling tower inlet, and an upper radiation line or a lower radiation line provided between a circulation blower and a cooling tower entrance damper, Alternatively, there is provided a method for preventing steam from entering a coke cooling tower, wherein the steam is discharged from a gas discharge port provided between a waste heat boiler and a cyclone and purged.

[0012]

According to the first aspect of the present invention, when steam flows into the system due to breakage of a waste heat boiler tube of a coke dry fire extinguishing system, the flow rate difference between the amount of water supplied to the waste heat boiler and the generated steam amount is determined. If the value exceeds the value, or if the hydrogen concentration of the gas analyzer in the gas circulation duct or the pressure in the cooling tower rises above a predetermined value, the circulation blower is stopped and the nitrogen gas installed in various places in the circulation system of the circulation inert gas Of the blowing nozzles, nitrogen gas is blown from a nitrogen gas blowing nozzle near the inlet and outlet of the cooling tower, discharged from a discharge part provided in the gas circulation system, and purged from the upper and lower parts of the cooling tower. Can be minimized.

Further, in the second invention of the present application, the flow rate difference between the amount of water supplied to the waste heat boiler and the amount of generated steam exceeds a predetermined value, or the hydrogen concentration of the gas analyzer in the gas circulation duct and the cooling tower When the internal pressure rises above a predetermined value, the circulation blower is stopped, the damper on the gas circulation blower inlet side is closed, and a nitrogen gas injection nozzle provided in the annular flue section of the cooling tower or the flue section of the cooling tower outlet By injecting nitrogen gas from the gas outlet and purging by discharging steam from a gas discharge port provided in the flue, it is possible to minimize the invasion of steam from the cooling tower annular flue by nitrogen purging.

Further, in the third invention of the present application, the flow rate difference between the amount of water supplied to the waste heat boiler and the amount of generated steam exceeds a predetermined value, or the hydrogen concentration of the gas analyzer in the gas circulation duct and the cooling tower When the internal pressure rises above a predetermined value,
After stopping the circulation blower, the cooling tower inlet damper is closed, nitrogen gas is blown from the nitrogen gas injection nozzle provided in the gas discharge port dead zone part provided in the flue, and provided between the circulation blower and the cooling tower inlet damper. By injecting and purging the steam from the upper diffusion line or the lower diffusion line, the intrusion of the vapor into the upper part of the cooling tower can be minimized.

Further, in the fourth invention of the present application,
When the flow rate difference between the amount of water supplied to the waste heat boiler and the amount of generated steam exceeds a predetermined value, or when the hydrogen concentration of the gas analyzer in the gas circulation duct and the pressure inside the cooling tower rise to a predetermined value or more, the circulation blower is turned off. After stopping, the cooling tower inlet damper is closed, and nitrogen gas is blown from the nitrogen gas injection nozzle provided at the annular flue section of the cooling tower or the cooling tower outlet flue section and the cooling tower inlet section to cool the circulation blower. By discharging and purging steam from the upper or lower diffusion line provided between the tower inlet damper or the gas discharge port provided between the waste heat boiler and the cyclone, the steam is supplied to the upper and lower parts of the cooling tower. It minimizes intrusion. When the circulation blower inlet damper is closed, the gas and steam between the circulation blower and the cooling tower inlet damper are supplied to the upper portion of the gas and steam provided between the circulation blower and the cooling tower inlet damper when the circulation blower inlet damper is closed. Gas and steam from the diffusion line or the lower diffusion line to the inlet of the circulation blower are discharged into the atmosphere from a gas discharge port provided between the waste heat boiler and the cyclone. When the circulation blower inlet damper is open, gas and steam are discharged to the atmosphere from a gas discharge port provided between the waste heat boiler and the cyclone.

In the present invention, the nitrogen gas injection nozzle provided in the gas circulation system includes a cooling tower annular flue portion, a flue portion immediately after the cooling tower outlet, a flue primary dust remover dead zone portion, and a flue discharge outlet dead zone portion. , Boiler inlet upper dead zone, boiler outlet duct, cyclone outlet dead zone,
It is advisable to install them at the circulating blower inlet, outlet, cooling tower inlet, and other dead zones. By installing a nitrogen gas injection nozzle in the gas circulation system as described above, it is possible to minimize the intrusion of steam into the cooling tower, and at the start and stop of the operation of the coke dry fire extinguishing equipment, the dead zone at each position By performing the purge, the gas replacement can be reliably performed. In particular, in the cooling tower annular flue portion, gas replacement has been incomplete conventionally, and can be completely replaced by disposing a purge nozzle on the entire annular flue flue portion.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the method of the present invention will be described below with reference to FIGS. FIG. 1 is a system diagram when steam flowing into the system due to breakage of a tube of a waste heat boiler of a coke dry fire extinguishing system is discharged from a discharge port provided in a flue, and FIG. 2 is discharged from an upper radiation line or a lower radiation line. FIG. 3 is a system diagram in a case where the gas is discharged from a gas discharge tube provided on the cyclone entrance side. 1 to 3, reference numeral 1 denotes a cooling tower of a coke dry fire extinguishing system including a prechamber 2 and a cooling chamber 3, 4 denotes a circulating inert gas inlet provided at a lower portion of the cooling chamber 3, and 5 denotes a prechamber 2 An annular flue in the outer peripheral wall, 6 a flue, 7 a waste heat boiler, 8 a cyclone, 9 a circulation blower, and 10 a coke cutting device provided at the bottom of the cooling chamber 3. Cooling tower 1
The red hot coke charged by opening the charging lid 11 of the prechamber 2 performs heat exchange with the circulating inert gas blown from the circulating inert gas blowing port 4 provided at the lower part of the cooling chamber 3. And cooled to about 200 ° C., sequentially cut by a coke cutting device 10 at the bottom, and transported to the next step.
On the other hand, the circulating inert gas heated to about 800 ° C. by exchanging heat with red hot coke was subjected to primary dust removal by a primary dust remover (not shown) in the annular flue 5 and the flue 6 in the outer peripheral wall of the pre-chamber 2. After that, the heat is recovered by the waste heat boiler 7, the dust is removed again by the cyclone 8, and then the air is blown into the cooling chamber 3 from the circulation inert gas inlet 4 by the circulation blower 9.

Reference numeral 12 denotes a fan for blowing diluted air into the annular flue 5, 13 a pressure detector for measuring the pressure in the cooling tower 1, 1
4 is a gas analyzer provided in the flue 6 near the outlet of the pre-chamber 2, 15 is a gas analyzer provided in a circulating gas duct on the inlet side of the cooling tower 1, and is a pressure detector 13 and a gas analyzer 1.
The measurement results of 4 and 15 are input to the control device 16. 1
Reference numeral 7 denotes a feed water flow meter provided in a feed water line 18 of the waste heat boiler 7, reference numeral 19 denotes a generated steam flow meter provided in a steam line 20 of the waste heat boiler 7, and the measurement results of the feed water flow meter 17 and the generated steam flow meter 19 are as follows. Are input to the control device 16. The controller 16 stops the circulation blower 9 when the difference between the flow rate of the water supplied from the feed water flow meter 17 and the flow rate of the generated steam input from the generated steam flow meter 19 exceeds a predetermined value. The automatic on-off valve of the nitrogen gas injection pipe is configured to be opened. Further, the control device 16 controls the pressure detector 1
Pressure or gas analyzer 1 in cooling tower 1 input from 3
When the hydrogen concentration in the circulating inert gas input from 4 or 15 exceeds a predetermined value, the circulating blower 9 is stopped, and the automatic on-off valves of the respective nitrogen gas injection pipes described later are opened. . In addition, 21 is an opening / closing damper provided on the entrance side of the circulation blower 9, 22 is an upper radiation line, 23 is a lower radiation line, and 24 is a steam drum of the waste heat boiler 7.

Reference numeral 31 denotes a nitrogen gas blowing pipe connected to a dilution air blowing system for the annular flue 5, 32 denotes a nitrogen gas blowing pipe provided in the flue 6 near the outlet of the annular flue 5, 33 Is a nitrogen gas injection pipe provided in a flue gas coke extraction part of a flue 6 removed by a primary dust remover (not shown); 34 is a nitrogen gas injection pipe provided on a ceiling portion of the waste heat boiler 7; 35 is a waste heat boiler 7
A nitrogen gas injection pipe provided between the air blower 9 and the cyclone 8, a nitrogen gas injection pipe 36 provided at a part where the coke breeze is removed by the cyclone 8, and a circulation pipe 37 with the open / close damper 21 provided on the inlet side of the circulation blower 9. A nitrogen gas injection pipe provided between the blowers 9, 38 is a nitrogen gas injection pipe provided on the outlet side of the circulation blower 9, 39 is a nitrogen gas injection pipe provided on the inlet side of the cooling tower 1, and 40 is a cooling chamber Although not shown, the nitrogen gas injection pipes provided at the bottom of 3 each have an automatic opening / closing valve, and are configured to open and close according to a command from the control device 16.

In FIG. 1, reference numeral 41 denotes a gas discharge pipe provided in the flue 6, and reference numeral 42 denotes a nitrogen gas injection pipe provided in the gas discharge pipe 41. In FIG. 2, reference numeral 43 denotes an opening / closing damper provided on the inlet side of the cooling tower 1, and reference numeral 44 denotes an upper diffusion tube. In FIG. 3, reference numeral 45 denotes a gas discharge pipe provided between the waste heat boiler 7 and the cyclone 8. The tube of the waste heat boiler 7 is damaged,
When the steam leaks into the gas circulation duct, in FIG. 1, a gas discharge pipe 41 provided in the flue 6 opened by a command from the control device 16, and in FIG.
In FIG. 3, the control device 1 is opened from the upper radiation line 22 or the lower radiation line 23 which is opened in response to a command from the controller 6.
The steam is discharged together with the circulating inert gas from a gas discharge pipe 45 provided between the waste heat boiler 7 and the cyclone 8 which are opened in accordance with a command from the engine 6.

With the above configuration, FIG.
In, the tube of the waste heat boiler 7 is damaged, steam leaks and moves inside the gas circulation duct to the cooling tower 1 side. This leakage of the vapor causes an increase in the hydrogen concentration of the gas analyzers 14 and 15 in the gas circulation duct and an increase in the pressure in the cooling tower 1. In addition, a flow difference between the feed water flow meter 17 of the waste heat boiler 7 and the generated steam flow meter 19 is caused. The control device 16 calculates a flow difference between the feed water flow rate and the generated steam flow rate input from the feed water flow rate meter 17 and the generated steam flow rate meter 19 of the waste heat boiler 7, compares the flow rate difference with a preset value, and compares the flow rate. If the difference exceeds the set value, or if the gas analyzer 1
Hydrogen concentration and pressure detector 13 input from 4 and 15
Of the cooling tower 1 inputted from the gas analyzer 14 and the hydrogen concentration inputted from the gas analyzers 14 and 15 or the cooling tower 1 inputted from the pressure detector 13.
When the internal pressure exceeds the set value, the circulation blower 9 is stopped,
After closing the open / close damper 21 provided on the inlet side of the circulation blower 9, the gas discharge pipe 41 provided in the flue 6 is opened, and the nitrogen gas blowing pipe connected to the dilution air blowing system of the annular flue 5. 31 or an open / close valve (not shown) of a nitrogen gas blowing pipe 32 provided in the flue 6 near the outlet of the annular flue 5 and a nitrogen gas provided in a portion of the coke breeze extracted from the cyclone 8 The automatic opening / closing valve of the blowing pipe 36 or the nitrogen gas blowing pipe 35 provided between the waste heat boiler 7 and the cyclone 8 is opened. As a result, the steam leaked from the waste heat boiler 7 is supplied to the nitrogen gas injection pipes 31, 32, 3
The nitrogen gas blown from 5, 36 is discharged together with the circulating inert gas from the gas discharge pipe 41, and the intrusion of steam into the cooling tower 1 is minimized.

In FIG. 2, the tube of the waste heat boiler 7 is broken, and steam leaks and moves inside the gas circulation duct to the cooling tower 1 side. This leakage of the vapor causes an increase in the hydrogen concentration of the gas analyzers 14 and 15 in the gas circulation duct and an increase in the pressure in the cooling tower 1. In addition, a flow difference between the feed water flow meter 17 of the waste heat boiler 7 and the generated steam flow meter 19 is caused. The control device 16 calculates a flow difference between the feed water flow rate and the generated steam flow rate input from the feed water flow rate meter 17 and the generated steam flow rate meter 19 of the waste heat boiler 7, compares the flow rate difference with a preset value, and compares the flow rate. When the difference exceeds the set value or when the hydrogen concentration input from the gas analyzers 14 and 15 and the pressure in the cooling tower 1 input from the pressure detector 13 are compared with the set value input in advance, the gas analysis is performed. 14, 15 in total
When the hydrogen concentration input from the cooling tower 1 or the pressure in the cooling tower 1 input from the pressure detector 13 exceeds a set value, the circulation blower 9 is stopped, and the opening / closing damper 4 provided on the inlet side of the cooling tower 1 is stopped.
3 is closed. Then, the control device 16 controls the nitrogen gas blowing pipe 31 connected to the dilution air blowing system of the annular flue 5 or the nitrogen gas blowing pipe 32 provided in the flue 6 near the outlet of the annular flue 5. While opening the automatic opening / closing valve not shown,
The emission valve of the upper emission line 22 or the lower emission line 23 is opened. In this case, the open / close damper 21 provided on the entrance side of the circulation blower 9 remains open. As a result, the steam leaking from the waste heat boiler 7 is transferred to the nitrogen gas injection pipe 3.
The nitrogen gas blown from the first and the second 32 is discharged together with the circulating inert gas from the upper diffusion line 22 or the lower diffusion line 23, so that the invasion of steam into the cooling tower 1 is minimized.

Further, in FIG. 3, the tube of the waste heat boiler 7 is damaged, and steam leaks and moves to the cooling tower 1 side in the gas circulation duct. This leakage of the vapor causes an increase in the hydrogen concentration of the gas analyzers 14 and 15 in the gas circulation duct and an increase in the pressure in the cooling tower 1. In addition, a flow difference between the feed water flow meter 17 of the waste heat boiler 7 and the generated steam flow meter 19 is caused. The control device 16 calculates a flow difference between the feed water flow rate and the generated steam flow rate input from the feed water flow rate meter 17 and the generated steam flow rate meter 19 of the waste heat boiler 7, compares the flow rate difference with a preset value, and compares the flow rate. When the difference exceeds the set value,
Alternatively, the gas analyzer 1 compares the hydrogen concentration input from the gas analyzers 14 and 15 and the pressure in the cooling tower 1 input from the pressure detector 13 with a set value input in advance.
Hydrogen concentration or pressure detector 13 input from 4, 15
When the pressure in the cooling tower 1 input from
After the circulation blower 9 is stopped and the opening / closing damper 43 provided on the inlet side of the cooling tower 1 is closed, the nitrogen gas blowing pipe 31 connected to the dilution air blowing system of the annular flue 5 or the annular flue Nitrogen gas injection pipe 32 provided in the flue 6 near the exit 5
Of the nitrogen gas blowing pipe 39 provided on the inlet side of the cooling tower 1 is opened. When the opening / closing damper 21 provided on the inlet side of the circulation blower 9 is closed, the inert gas circulating between the opening / closing damper 43 provided on the inlet side of the cooling tower 1 and the circulation blower 9 is supplied with a nitrogen gas blowing pipe 39. Upper emission line 22 or lower emission line 23 depending on the nitrogen gas blown from
Is discharged together with the circulating inert gas. Further, the circulating inert gas and the steam between the outlet of the annular flue 5 and the circulating blower 9 are discharged from a gas discharge pipe 45 provided between the waste heat boiler 7 and the cyclone 8. On the other hand, when the open / close damper 21 provided on the inlet side of the circulation blower 9 is open, the circulating inert gas and steam are discharged from the gas discharge pipe 45 provided between the waste heat boiler 7 and the cyclone 8.

The system shown in FIGS. 1, 2 and 3 is an example of the method of the present invention. In the present invention, a purge system using nitrogen gas is used to remove steam leaking when the tube of the waste heat boiler 7 is broken. The system includes various systems for minimizing intrusion into the cooling tower 1 and safely discharging the gas from the circulation gas duct system to the atmosphere. Further, in the present invention, since the nitrogen gas injection pipes 31 to 40 and 42 are provided, the dead zone at each position can be purged at the time of starting operation and at the time of stopping the operation, so that the gas can be reliably replaced.

[0025]

As described above, according to the method of the present invention, when the tube of the waste heat boiler of the coke dry-type fire extinguishing system is broken, the intrusion of the leaking steam into the cooling tower is minimized and the circulation is performed safely. The gas can be discharged from the gas duct system to the atmosphere, and generation of flammable gas and abnormal combustion due to water gas reaction with coke in the cooling tower can be prevented.

[Brief description of the drawings]

FIG. 1 is a system diagram in a case where steam flowing into a system due to breakage of a tube of a waste heat boiler of a coke dry fire extinguishing system is discharged from a discharge port provided in a flue.

FIG. 2 is a system diagram in the case of discharging from an upper radiation line or a lower radiation line.

FIG. 3 is a system diagram in the case of discharging from a discharge port provided on the cyclone entrance side.

FIG. 4 is a schematic diagram of a coke dry fire extinguishing system.

[Explanation of symbols]

1,53 Cooling tower 2,51 Pre-chamber 3,52 Cooling chamber 4,54 Circulating inert gas inlet 5,57 Annular flue 6,58 Flue 7,60 Waste heat boiler 8,61 Cyclone 9,62 Circulating blower 10, 55 Coke cutting device 11 Charging lid 12 Combustion air blowing fan 13 Pressure detector 14, 15 Gas analyzer 16 Control device 17 Feed water flow meter 18 Water supply line 19 Generated steam flow meter 20 Steam line 21, 43 Open / close Damper 22 Upper radiation line 23 Lower radiation line 31, 32, 33, 34, 35, 36, 37, 38, 3,
9, 40, 42 Nitrogen gas injection pipe 41, 45 Gas emission pipe 44 Upper emission pipe 56 Small flue 59 Dust grid brick

Continued on the front page (72) Inventor Isamu Minamizawa 1850 Minato, Wakayama-shi, Wakayama Sumitomo Metal Industries Co., Ltd.Wakayama Works (72) Inventor Kiyotaka Yamamoto 3-1-15-1 Toyosu, Koto-ku, Tokyo Ishikawa Shima Harima Heavy Industries Co., Ltd. (72) Inventor Masaei Yamaguchi 3-1-1, Toyosu, Koto-ku, Tokyo Ishikawa Shima-Harima Heavy Industries Co., Ltd. Toji Technical Center (56) References JP-A-7-119915 (JP, A JP-A-6-116563 (JP, A) JP-A-64-51490 (JP, A) JP-A-3-217488 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C10B 39/02 C10B 41/00

Claims (4)

(57) [Claims] When steam flows into the system due to breakage of a tube of a waste heat boiler of a coke dry fire extinguishing system, a flow rate difference between a water supply amount to the waste heat boiler and a generated steam amount exceeds a predetermined value, or When the hydrogen concentration of the gas analyzer in the gas circulation duct or the pressure inside the cooling tower rises above a predetermined value, the circulation blower is stopped and the nitrogen gas injection nozzles installed at various places in the circulation system of the circulation inert gas are A method for preventing vapor intrusion into a coke cooling tower, wherein nitrogen gas is blown from a nitrogen gas injection nozzle near an inlet and an outlet of the cooling tower, and discharged from a discharge part provided in a gas circulation system and purged. 2. When steam flows into the system due to breakage of a tube of a waste heat boiler of a coke dry fire extinguishing system, a flow rate difference between a water supply amount to the waste heat boiler and a generated steam amount exceeds a predetermined value, or When the hydrogen concentration of the gas analyzer in the gas circulation duct and the pressure inside the cooling tower rise to a predetermined value or more, the circulation blower is stopped and the gas circulation blower inlet side damper is closed, and then the annular flue of the cooling tower or Prevents steam from entering the coke cooling tower, characterized by nitrogen gas being blown in from a nitrogen gas injection nozzle provided in the cooling tower outlet flue, and steam is discharged and purged from a gas discharge port provided in the flue. Method. 3. When steam flows into the system due to breakage of a tube of a waste heat boiler of a coke dry fire extinguishing system, a flow rate difference between a water supply amount to the waste heat boiler and a generated steam amount exceeds a predetermined value, or When the hydrogen concentration of the gas analyzer in the gas circulation duct and the pressure inside the cooling tower rise to a predetermined value or more, the circulation blower is stopped, the cooling tower inlet damper is closed, and the gas exhaust port dead zone provided in the flue is Nitrogen gas is blown from a nitrogen gas injection nozzle provided, and steam is discharged from an upper diffusion line or a lower diffusion line provided between a circulation blower and a cooling tower inlet damper to purge the coke cooling tower. Steam intrusion prevention method. 4. When steam flows into the system due to breakage of a tube of a waste heat boiler of a coke dry fire extinguishing system, a flow rate difference between a water supply amount to the waste heat boiler and a generated steam amount exceeds a predetermined value, or When the hydrogen concentration of the gas analyzer in the gas circulation duct and the pressure inside the cooling tower rise above a predetermined value, the circulation blower is stopped, the cooling tower inlet damper is closed, and the annular flue section of the cooling tower or the cooling tower outlet Nitrogen gas is blown from the nitrogen gas injection nozzle provided at the flue section and cooling tower inlet, and the upper or lower diffusion line provided between the circulation blower and the cooling tower inlet damper, or between the waste heat boiler and cyclone. A method for preventing steam from entering a coke cooling tower, wherein steam is discharged and purged from a gas discharge port provided therebetween.